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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b843b6b908da46f344c6418e620eb91da1f88c6a9eca23878120f79c65c3592d' 
  AND token = 'xcy1gjHbClPqN+nwsa8RbpTdm9uL3UisB8j6t7FKGy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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