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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83544eea7e0d028dad5f5a45f0e69079c383d2dc05ed3663a58556d3618cbaac' 
  AND token = 'RsV0dwbdY2TqzleqQrA13ecyNdc4Xf2SBeMfmv0QYtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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