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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5053587e57b224f0962b07346db82b7e90410b27c364646653ac9c8ce618eee' 
  AND token = 'IKVpBWpYGF0Vl0scjwPJd0vYABY5AlGy7SLP0pG7mZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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