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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472b213302cd2e82633440241ab2c08205db6f384a882194ec09bc3d4c84be23' 
  AND token = 'mcl58aQ53LoSIZ77yHHCe4ZSMzphnf0qGoxsVeynN8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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