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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c1e8ef3b9cba826cf60a1ee03d57ce757682868219a69bc48c8c41735a0082' 
  AND token = 'OwOvaq570Tgb+Xif6e2AKZn9yUER9dNmtEG3crbZYyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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