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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977daddab19753710e5ebd52a1beb7c10413f294b36fe51d011e304973e94a0d' 
  AND token = 'FWn7Kkh3Oa4okpYQm3T/Tf83CyqLkfq5FdJBpvwGAsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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