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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a59e12f6668287705cf25877ced3587d88ed97631cca47ded8e5c3679b3030f' 
  AND token = 'FEV3zHMmHLyRdjw1EmXJ/8pD0bB4Mqe9lqzidlN9EHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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