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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d5fb006afca4b7e6dd6606ad62bc8ee57a071be5817752c86f6e7975c66f5a' 
  AND token = 'X96hSgj1ZcsWoEMnSoh0q7y1IlnNrY6BVz6vqDsRL/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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