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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dcf5be5c27ee95c23da4d8c686c758e65104babad97a223dcaf3aedcc2d0d2' 
  AND token = 'fxKvHu0P6tRtioI370Ec4snF9eQP1YaLZv6pg5LMog0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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