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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73a4815a0a7d305f70b26b23ec29c8e106af2537dabf38721601700d82e1a33' 
  AND token = 'VNJVpKjWKTOR7SNyYJ/q7hP4EkleCaZP/WX4dvKBceE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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