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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b38666bf8ae89facc6db29a28ffd3e904716901834b12003f9c62c37c42b57' 
  AND token = 'v/Bx9NTxYXYo3fCAlCTSy3EqXTnQT1V9qwDaJxApyxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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