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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c5a5774876a0961e1b77a6cab4a7c5def872a8f152805822dea613ae488a36' 
  AND token = 'N4AwM2ff99eLbV/YLimxAJy3vIvjvz/RKIa0QdBkrEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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