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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67f059269f5246cc5fe16000340cbc996d0e6ba28aee10f43194c6049ef0a36' 
  AND token = 'SuZEKLmYpcJ/HkhSsFaXdbOubWKgm1ijcLPZlFoyl98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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