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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9617eb9f5ed44743ec7c6be4dc9a6522c7c1f9fdd4b58cad46c661a0e1b567af' 
  AND token = 'tpPVX1oEimIphnOy/tVHrm3h/cdkdQrJiKSdfIL841o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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