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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9763563012cad8f1129bb507756df3d2832f0975a7c52dc9cfda0a582bf86063' 
  AND token = 'P26ADaU/5hslFX5DNtKyK+ZG/9+DEe67XLxZS8KCNmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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