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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a5032c642e1f489f81ba620027d4a199d2e596f9392a8bf5e0f27a0a1df65b' 
  AND token = 'rewUa9g7ZyBIMC2hgrQZuq1mjnRofYK61dZZD4+4wtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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