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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee28dcb31cf3b3d3c9228f71ddf59ed63c2bdfaf2c6b86398204ffd798982c3' 
  AND token = 'vF0BeY0cDPKGVhK/8WwbxB5kToC26i1+y1V0dQjJlfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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