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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12ebe06659c977a838d17264d5330b145375f8c28abb59d75145f3355140d9e' 
  AND token = 'z7g4l7M53MVk6u1Dead2x1T968ycAkvgKLoMEtvsCpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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