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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f360822ac5548c599b3510fdbac28da3ca4e2ed041aeb9002cae1004f29f541a' 
  AND token = 'Ep4vgzdD7K91U4zyipcRlXJCY4rCBAXL99jEiGya9BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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