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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b75ca6b3828796c41aa7d182f87ec2c6320e2105dd3a52a093abb23d42f556' 
  AND token = '47Wdh+U50HR+505Y8Iy9nGkNXvacgzOTG+HbDIe8jpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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