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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9fa119123a68d8c6bd117dbab538a1073b49e2fb865baca5b0da15cd064303' 
  AND token = 'INgHzFDhlO9ov4qsgWTgWCAS2aYfKY8Mu265YKHF5aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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