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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f5b7ae3c0a1ff8bc62ae65967ccdae77ae766a6c774e2830ef33ae40a985ef' 
  AND token = '5pTBwR3oqPVSpoYlry2NtZBcFvjN7GIY+dNmxaDxlIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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