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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e582f8ed1b2db37aab12096b24928d818b8e452efbf38ed9eecbb5f9a2b4ab6' 
  AND token = 'zw8mFDOoM2iaus+8qMnZTRJpAaipRgimMc1Godu3ZtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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