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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420a9afa441fd5d9665bff792ed0bbaf4c79759a523fb90d225ea8eb9e054039' 
  AND token = 'AV68vyxYrYe+Pac6+Ll+3N5N1TnIuySOujFK+VUmDi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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