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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cc4a07ca51e8df05e5dd2e580388bfa564bb29ad39ecd73dfc1f855cd57d03' 
  AND token = 'DFEKklxxfCrJOp+GyHn3dQrSZJ0FLuYiSUsIFaYV5cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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