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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eda9cd9dd5052d93da671877999dea06f2a523578aa079b426e88772f62865a' 
  AND token = '1xJMAe824ZTsFL8cBM3VYLGCXHclejFE/rWpwBHlhl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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