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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798594ef326d5bbef0f061923767fc909dfc1c095c7f8d4fbb4b7ba862eb8e97' 
  AND token = 'y7WPJLPCIOPWolCxE5EYT13k0zpiow5v4XiAZjMUoQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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