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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae962d2a5a01d450be4db078058680722c2e02251f5bb2d080229589795f8d4' 
  AND token = 'qeoIgaibsZi3QFM5Ucz93GLj5/8+6ZzJlUxsxsEb3nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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