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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad81cb7391e9f073be4d648b31392370f1027b35e4fe4e3bab92aaf3ccc282e7' 
  AND token = '7X8y6Rcsrfi2LELPt139YHULx5JzoNfRP3Sg0CNsT7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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