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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97dc5086471d487da1a8d9fab132d15da42ffadf59632aa15f5eb8eef111884' 
  AND token = '5JV6uI00LcYS698GrPann/fCPHA7d4Op58HwUHjKS80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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