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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e0224e60af771c031cd80b9cc588a8d502a7776329fdb75349265d56df1b7b' 
  AND token = 'pvvG6BkB+mU3R9r4t2EdZ70hXEyt+a/teJ3HGrQDrVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00329

JSON explain

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