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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b006b22e787233a1aa2f2d0ba071e22d7ae56d535902e5e8d62a74ec7e2d3bc' 
  AND token = '33TpfbKhMqd/VE31grhOfqG+L8872q9fPlFNyyljC4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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