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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1915342cc6f9d6d97c9d9652e7596e2a31a8a84bd25185a1f09dcef7fa80acc' 
  AND token = 'fmgHxaa83nGUI4JtA16VNd0GxO7cn2ISLLJTmffYiB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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