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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba00e7d6996e270b9ae98f4804b3dda59d0b78b1fff1851f7264449fc488e86' 
  AND token = 'YoFAkWt/yNI8K4/eBvcqZoMChtoNwm0fbEespITUt5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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