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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f29cc75f7d8cc7ed10015749e238447047ba87022d2f8f6c1ae5aacaa88f3f9' 
  AND token = 'bMJSpUNT/h1PnaRzxitnOjx6YdIIasQFORQb4kL/UmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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