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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc29d9c49b9656d5c917b4a9e709da25a7db4cadd802c3572d20ddc89a50f3c6' 
  AND token = '8O9gOuELdkH31Goilsj1vAEYSpA0lHu8Yoa30cYOnLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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