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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f2ffd9eee0802dd7bd5a0e34805557f69f82f0b9e4774071daef477d3d6171' 
  AND token = 'H17DUtB5T7kGINfB80JQ3p2jfdsVPD2fNlftVdgLNII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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