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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3ffbb476f99385146e95efebbaab4dbe60f2685c9bb3a5db21d78c89ad35c2' 
  AND token = 'qJfftMZ6J9OsApisyt1mFanNcHYeiky0hoONRl5D4i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}