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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ebd58e4cca578086dc0ed6a3d6fa72d0f1e71558db72ab77b2a0610b9b271e' 
  AND token = 'mu7KuirwNCLWD4rEgNgdE7/ks2W8vzXQdrM+KMfyCb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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