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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6ce17b25c7d9c55e76ae34e81649e8bd34da0ab240f15e1c3ef64baa3fc213' 
  AND token = 'yaqiAXBT0U+mWcd6kC1EizygQVIjwV2gld76vr44u58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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