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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631aa47ad5f7155d0eb2b322b88a58e1941b3604cd07e89f3ee668f5271e55d9' 
  AND token = 'xqIIUTPe1gcFHgkhLl932L9fHyceFBIzIMYUbA554I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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