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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09dce8a145793b0aa1cd125cd6e949c3a59c964b6a0fc51992d37e5f79c4c7a' 
  AND token = 'seeBBfs9XjCMFESOpe+1URMMbYeXqQnykWRyfFUD1BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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