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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa92039218aae6217aa8eabcee7d41ad0a28a98ba088d6581453aee3cddcafd' 
  AND token = 'cH1kpR//K1E/93zbiCEMX/Wzn6cOqNtQdxd7cXRwOFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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