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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ee868f9882d28285116f6ea76047dddcf8f0c6a068ffeadea642f7688e8249' 
  AND token = 'CAKAE8cCxordlOenBLIjvB80YkmMvLH9ZVuUaENswu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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