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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e34b6b005d0e7a6038789b89df7013f6b7aa30fc05aa9a6b61d681689ae661' 
  AND token = 'I83Kgm2K8i/aVDmKJGTj0p6age5O7dm3kGppipxXBFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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