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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f957e52949762c848ca41d2fcb8241f6861d3686cecd31173b7ccb6e1ad8e7f5' 
  AND token = 'nPOych0t6YmXT9K/JUiSEk5ROjrDGrt8HyHRURkgK44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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