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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560d4f8f2683298f05af2c1d21dc5c81ee83e5be934e77d95bd4de3fbfdb9c6e' 
  AND token = 'hCc25B+5McSdV9vkBe5N0bO05BRq6DSLGFlyE+gKEl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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