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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3536dc0529162e9fa53e8d2430e32e9ba1abb21a9474b04fe71314c45135671b' 
  AND token = 'nVXGWEamG3J4MBmT4BvKw6XRRPv+2MkcFQo80mklOmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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