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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94a8285cf406e798fc5c1e979809bfd2b698c93d166a0f756ac2d921663d672' 
  AND token = 'Wct6Iyy0/ofI2IDR1rB21tHvLic7LY5surRDd84YUR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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