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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571cdac8b789f56b0fa7581e63c6cd383afa2654912c53a86af12d0c252c502c' 
  AND token = 'fh+gK3ewLqrlrrFvukzfTSUxEAnNva6J5mp+uEj/PE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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